JPH09315570A - Pressure adjusting device for rotary feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure adjusting device for a rotary feeder, by which differential pressure between the side for receiving powder such as cement and the supplying side is eliminated, the smooth movement of powder such as cement can be maintained for a long period without being affected by the various conditions such as the temperature, air pressure, etc., and the smooth movement of powder such as cement can be performed by previously applying flowability to powder such as cement on the supplying side through a process of applying high-pressure air to the supplying side. SOLUTION: A supplying chamber 13 positioned on an upper opening part 14c of a rotary feeder 14 and for supplying powder such as cement is communicated with a plurality of divided chambers 16c communicated with the upper part opening part 14c of the rotary feeder 14, divided by a rotary fan 16 and rotationally moved by a pressure reduction pipe 20, high-pressure air in the divided chambers 16c from which powder such as cement is fed out is fed into the supplying chamber 13, the movement of the powder such as cement is stopped by a metallic filter 1 arranged in the pressure reduction pipe 20, and the movement of air is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure adjusting device for a rotary feeder, and more particularly to a pressure adjusting device for a rotary feeder which improves the efficiency of powder transfer into the rotary feeder.

[0002]

2. Description of the Related Art Conventionally, a rotary feeder has been used to convey powder such as cement. Usually, a rotary feeder sends powder such as cement into a divided chamber formed between an inner wall and adjacent partition blades of a plurality of partition blades that form a rotary fan,
The rotary fan is rotated to divide the powder of cement or the like into fixed amounts, and the divided powder of cement or the like is conveyed by high-pressure air through a delivery pipe.

[0003]

However, in the rotary feeder as described above, the pressure inside the division chamber is high immediately after the powder of cement or the like is sent out, so that when the powder of cement or the like is received again. The smooth movement of powder such as cement into the division chamber was hindered. In particular, each time the rotary fan makes one revolution, it must be received once, so the receiving time is very short, and the pressure difference between the receiving side and the supplying side hinders the smooth movement of powder such as cement. There was a problem that

Therefore, in order to eliminate the pressure difference between the receiving side and the supplying side of powder such as cement of the rotary feeder, various mechanisms for reducing the pressure in the receiving chamber have been considered. It was very difficult to adjust only the air pressure. A simple mechanism is to connect the receiving compartment and the supply compartment with a pipe, etc., but it is necessary to block the movement of powder such as cement and only allow the movement of air. Therefore, cloth and canvas were used to separate air and powder. But,
Due to various conditions such as temperature due to frictional heat, air pressure, etc., it cannot be used continuously for a long period of time, and there is a problem that the initial state cannot be maintained due to clogging or the like.

Therefore, the present invention eliminates the pressure difference between the receiving side and the supplying side of the powder of cement or the like, and the smoothness of the powder of cement or the like can be achieved without being affected by various conditions such as temperature and air pressure. The movement can be maintained for a long period of time, and high-pressure air is supplied to the supply side so that the powder such as cement on the supply side has fluidity in advance, and the movement of powder such as cement is smoother. It is an object of the present invention to provide a pressure adjusting device for a rotary feeder which can be realized.

[0006]

According to a first aspect of the present invention, there is provided a pressure adjusting device for a rotary feeder, wherein a supply chamber for supplying powder such as cement to an upper opening of the rotary feeder and an upper opening of the rotary feeder. A plurality of division chambers that are connected to each other and are rotated by a rotary fan, and the division chambers and the supply chamber are communicated with each other, and the high pressure air in the division chamber after the powder such as cement is discharged is sent into the supply chamber. It is provided with a pipe and a metal filter which is arranged in the decompression pipe and blocks movement of powder such as cement and enables movement of air. Here, a motor or the like is used as a power source of the rotary feeder, but a combustion engine, a steam engine, wind power, hydraulic power, or the like may be used.

Therefore, according to the pressure adjusting device for a rotary feeder of the invention of claim 1, before the dividing chamber after the powder of cement or the like is conveyed to the outside by the high pressure air, the powder of cement or the like is received again, Since the high-pressure air in this division chamber is sent into the supply chamber through the decompression pipe, when the division chamber again receives powder such as cement, the pressure in the supply chamber and the pressure in the division chamber become approximately equal, and the cement in the supply chamber It is possible to impart fluidity to the powder such as cement in the supply chamber by applying high-pressure air to the powder such as. In addition, powder such as cement in the supply chamber does not flow out into the division chamber through the pressure reducing pipe.

According to a second aspect of the present invention, there is provided a rotary feeder pressure regulating device according to the first aspect, wherein the metal filter is formed by welding a plurality of gun metal particles. Here, the gunmetal particles include alloys having a copper-tin ratio of about 9: 1, but they also have corrosion resistance, and when placed in a mold and heated at a predetermined temperature, adjacent particles come into contact with each other. Any particles may be used as long as they are particles made of a material that only melts and melts.

Therefore, according to the pressure adjusting device for a rotary feeder of the invention of claim 2, in addition to the function of the pressure adjusting device for the rotary feeder of claim 1, the metal filter is formed by welding a plurality of gun metal particles. Because it has been
The size and shape of the gap formed in the metal filter through which the high-pressure air moves are substantially uniform, the powder such as cement is unlikely to be clogged in this gap, and the durability of the metal filter itself is excellent.

[0010]

Embodiments of the present invention will be described below. 1 is a front view showing a pressure adjusting device for a rotary feeder according to an embodiment of the present invention, FIG. 2 is a right side view showing a pressure adjusting device for a rotary feeder according to an embodiment of the present invention, and FIG. 4 is a sectional view showing a section AA of the pressure adjusting apparatus for a rotary feeder, FIG. 4 is an enlarged sectional view showing a section BB of the pressure adjusting apparatus for a rotary feeder of FIG. 3, and FIG. It is an expanded sectional view shown.

As shown in FIGS. 1 to 5, a powder conveying system for conveying powder of cement or the like using a rotary feeder includes a cylindrical silo 11 for storing powder of cement or the like, A hopper 12 extending from the lower opening of the silo 11 and converging the opening in a funnel shape;
A supply chamber 13 extending substantially the same as the convergent opening of
The rotary feeder 14 and the decompression pipe 20 that connects the division chamber 16c of the rotary feeder 14 and the supply chamber 13 to each other.
And a motor 15 serving as a power source for rotating the rotary fan 16 of the rotary feeder 14, and a blowing unit (not shown) for blowing high-pressure air to the divided chambers 16c of the rotary feeder 14. The rotary feeder pressure adjusting device 10 of the present embodiment is incorporated in the decompression pipe 20 that connects the division chamber 16c of the rotary feeder 14 and the supply chamber 13 to each other.

The silo 11 has a substantially cylindrical shape, and a funnel-shaped hopper 12 is extended in the lower opening. The hopper 12 converges as it goes downward, and a disc-shaped flange 12a is formed at the lower end.

The supply chamber 13 has a substantially cylindrical shape having an opening diameter substantially equal to the opening diameter at the lower end of the hopper 12, and flanges 13a and 13b, which are substantially equal to the flange 12a of the hopper 12, are formed in the opening portions at both ends. ing.

At the upper part of the rotary feeder 14, a cylindrical connecting portion 14b having an opening 14c whose diameter is substantially equal to the diameter of the supply chamber 13 is provided. The upper end of the connecting portion 14b has a flange 1 that is substantially the same as the flange 13b of the supply chamber 13.
4a are formed.

The hopper 12 and the supply chamber 13 are connected by a bolt or the like in a state where the outer circumferences of the flanges 12a and 13a are brought into contact with each other, and the supply chamber 13 and the rotary feeder 14 are connected to the flanges 13b and 14a. Are joined together by bolts or the like in a state where the outer peripheries of the two are in contact with each other.

Inside the rotary feeder 14, FIG.
As shown in, the rotary fan 16 is mounted so as to be rotatable about the shaft member 16e. The rotary fan 16 is provided with a base portion 16d located on the central axis of the rotary feeder 14 and radially extending around the base portion 16d.
It has a plurality of partition blades 16b arranged at equal angles. The partition blade 16b has a width substantially equal to the inner width of the rotary feeder 14, and a length from the base 16d to the rotary feeder 1.
4 is substantially equal to the distance of sliding contact with the inner peripheral surface. Then, between the adjacent partition blades 16b among the partition blades 16b, divided chambers 16c are formed which divide the space in the rotary feeder 14 at equal intervals. A shaft member 16e extending to the rear outside is inserted into the base portion 16d at the central axis position of the rotary feeder 14.

A motor 15 is installed next to the rotary feeder 14, and the rotation shaft of the motor 15 projects rearward at a position parallel to the shaft member 16e. As shown in FIG. 2, sprockets 15a and 16a are fixed to the extending portion of the shaft member 16e from the rotary feeder 14 and the rotation shaft of the motor 15, respectively. It is connected. Further, the motor 15 is connected to a power source (not shown) so as to rotate counterclockwise when viewed from the front. Therefore, when the motor 15 rotates, the rotary fan 16 in the rotary feeder 14 rotates counterclockwise when viewed from the front.

In this powder conveying system, powder such as cement stored inside the silo 11 is transferred to the hopper 12.
And to the rotary feeder 14 through the supply chamber 13. Then, as the rotary fan 16 provided in the rotary feeder 14 rotates, the powder of cement or the like is subdivided into the dividing chamber 16c by a predetermined amount and moves downward. A blower pipe 18 is fixed below the rotary feeder 14, and on the rear surface of the rotary feeder 14, at a position communicating with the blower pipe 18,
The delivery pipe 19 is extended. From the blower pipe 18 to the rotary feeder 14, high pressure air (not shown)
And the delivery pipe 19 is connected to the destination of the powder such as cement. Therefore, the powder of cement or the like in the dividing chamber 16c, which has been subdivided into the dividing chamber 16c by a certain amount and has moved downward, is delivered to the destination through the delivery pipe 19 by the high pressure air delivered through the blower pipe 18. Is transported. At this time, the powder of cement or the like is in a mixed state with high-pressure air and has fluidity, so that the powder smoothly moves even if the diameter of the pipe for transportation is small to some extent.

The right side of the rotary feeder 14 and the right side of the supply chamber 13 are connected by a pressure reducing pipe 20. The decompression pipe 20 is composed of a pipe 22 extending directly from the supply chamber 13 and a pipe 21 extending directly from the rotary feeder 14, and flanges 22a, 21a having the same outer diameter are provided at the tips of the pipes 22, 21. Are formed respectively. As shown in FIG. 5, the flanges 22a, 21a
Are brought into contact with each other at positions where their outer peripheries substantially coincide with each other and are fixed by bolts or the like (not shown). At this time, the flange 22a,
Inside the abutting portion of 21a, the diameter of the flanges 22a, 2a
1a is smaller than the outer diameter, is larger than the inner diameters of the pipes 21 and 22, and has a thickness smaller than the sum of the thicknesses of the flanges 22a and 21a. The metallic filter 1 is interposed in the space 23. That is, the pipes 21 and 22
The internal space is divided by the metal filter 1 with the connecting portion as a boundary.

Here, the metal filter 1 will be described. FIG. 6 is a perspective view showing a metal filter of a pressure adjusting device for a rotary feeder according to an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged explanatory view showing an arrangement state of gun metal particles constituting a metal filter of a pressure adjusting device for a rotary feeder according to an embodiment of the present invention.

The metallic filter 1 has a disk-like appearance as shown in FIG. 6, and a plurality of spherical fine particles of fine gunmetal having a substantially uniform diameter are put into a mold, and adjacent gunmetal particles 2 are formed. It is made by fusing together. Therefore, the metal filter 1 has a plurality of minute gaps as shown in FIG. 7. If the particles of the gun metal particles 2 are selected so that the diameter of the circle 3 inscribed in the gap of the gun metal particles 2 is about 60 μm, the metal filter 1 becomes a filter that allows air to pass but prevents cement powder from passing. .

Thus, this rotary feeder 14
Includes a supply chamber 13 that supplies powder such as cement to the upper opening 14c of the rotary feeder 14 and a plurality of division chambers that communicate with the upper opening 14c of the rotary feeder 14 and that are divided by a rotary fan 16 to rotate. 1
6c, the division chamber 16c and the supply chamber 13 are communicated with each other, and the decompression pipe 20 for feeding the high pressure air in the division chamber 16c after the powder such as cement is sent into the supply chamber 13 and the decompression pipe 20 Is installed to prevent the movement of powder such as cement,
A pressure adjusting device 10 for a rotary feeder, which is equipped with a metal filter 1 capable of moving air, is assembled.

Normally, the pressure in the division chamber 16c that passes through the lower portion of each of the division chambers 16c and goes to the upper portion again is due to the high-pressure air sent from the blower pipe 18.
It is in a high pressure state. Therefore, if it goes upwards as it is, it pushes up the powder of cement or the like upwards, and it will go downward again without receiving a sufficient amount of powder of cement or the like. Since the right side of the rotary feeder 14 and the right side of the supply chamber 13 are in communication with each other by the pressure reducing pipe 20, the high pressure air in the division chamber 16c receives powder such as cement above the division chamber 16c. Before moving to the position, it moves below the supply chamber 13 and the internal pressure in the division chamber 16c is reduced. Therefore, the division chamber 16c that has moved upward again
Can receive a sufficient amount of powder such as cement. Further, the powder of cement or the like stored in the supply chamber 13 is compressed due to the weight of the powder of cement or the like accumulated above and loses fluidity, but compressed air sent through the decompression pipe 20. The liquidity can be regained by. At this time, by the metal filter 1, the supply chamber 13
The powder such as cement in the inside does not move into the rotary feeder 14 through the pressure reducing pipe 20, and only the high pressure air flows into the supply chamber 13.

That is, in the rotary feeder pressure adjusting apparatus 10 of the present embodiment, the dividing chamber 16c, which once sent the powder of cement or the like received to the outside by high-pressure air, receives the powder of cement or the like again. Since the internal high pressure air is sent into the supply chamber 13 through the pressure reducing pipe 20, when the division chamber 16c receives the powder such as cement again, the pressure inside the supply chamber 13 and the pressure inside the division chamber 16c are substantially equal. it can. Therefore, the movement of the powder such as cement is not hindered by the pressure difference between the receiving side and the supplying side of the powder such as cement. Further, by applying high-pressure air to the powder of cement or the like in the supply chamber 13, the powder of cement or the like in the supply chamber 13 can be made to have fluidity. You can move your body more smoothly. Further, by the metal filter 1, the supply chamber 1
Since the powder of cement or the like in 3 does not flow into the division chamber 16c through the pressure reducing pipe 20, the powder of cement or the like does not clog the pressure reducing pipe 20, and the powder of cement or the like inside is delivered by high pressure air. Immediately after that, the pressure in the division chamber 16c can be stably reduced, and high-pressure air can be stably supplied to the powder such as cement in the supply chamber 13.

In particular, in the pressure adjusting device 10 for a rotary feeder of this embodiment, the metal filter 1 is formed by welding the gun metal particles 2 having a plurality of uniform sizes, and the metal filter 1 is formed on the metal filter 1. Since the size and the shape of the gap through which the high-pressure air moves are substantially uniform, the powder such as cement is unlikely to be clogged in the gap, and the durability is superior to that of a filter made of cloth or canvas. Normally, the rotary feeder 14 is heated to a high temperature due to frictional heat and the like, so that the high-pressure air is also heated, but the metal filter 1 is also resistant to heat. As a result, it has a long-term maintenance-free property and can be easily regenerated by just cleaning it during maintenance and inspection.

By the way, in the above description, the motor 15 is used as the power source for rotating the rotary fan 16. However, the power source is not necessarily limited to the motor 15.
It may be a combustion engine, a steam engine, wind power, hydraulic power, or the like.

The blowing means for feeding the high-pressure air from the blowing pipe 18 into the divided chamber 16c of the rotary feeder 14 may be one that rotates various fans, turbines, or the like, but may be one that uses a high-pressure cylinder. However, in terms of economy, it is preferable to use an air blowing unit that rotates various fans, turbines, and the like.

[0028]

As described above, in the pressure adjusting device for a rotary feeder according to the first aspect of the present invention, the dividing chamber receives the powder of cement or the like again after the powder of cement or the like is conveyed to the outside by high pressure air. Before, the high pressure air in this division chamber is sent into the supply chamber through the decompression pipe, so when the division chamber receives the powder such as cement again, the pressure in the supply chamber and the pressure in the division chamber become almost equal. The movement of the powder such as cement is not hindered by the pressure difference between the receiving side and the supplying side of the powder. In addition, by supplying high-pressure air to the powder such as cement in the supply chamber, the powder such as cement in the supply chamber can be made to have fluidity, so that the powder such as cement moves to the split chambers more efficiently. It can be done smoothly. Further, since the powder of cement or the like in the supply chamber does not flow out to the division chamber through the pressure reducing pipe, the pressure reducing pipe is not clogged with the powder of cement or the like, and immediately after the powder of cement or the like inside is delivered by the high pressure air. It is possible to stably reduce the pressure in the divided chamber and to stably supply high-pressure air to the powder such as cement in the supply chamber.

In addition to the effect of the pressure adjusting device for a rotary feeder according to claim 1, the pressure adjusting device for a rotary feeder according to a second aspect of the present invention has a size of a gap in which high pressure air formed in the metal filter moves, and The shape is almost uniform, and powder such as cement is unlikely to be clogged in this gap,
Since the metallic filter itself has excellent durability, it has a long-term maintenance-free property and can be easily regenerated by cleaning it during maintenance and inspection.

[Brief description of drawings]

FIG. 1 is a front view showing a pressure adjusting device for a rotary feeder according to an embodiment of the present invention.

FIG. 2 is a right side view showing a pressure adjusting device for a rotary feeder according to an embodiment of the present invention.

[FIG. 3] A of the pressure adjusting device for the rotary feeder of FIG.
It is sectional drawing which shows -A cross section.

[Fig. 4] B of the pressure adjusting device for the rotary feeder of Fig. 3.
It is an expanded sectional view showing a -B section.

5 is an enlarged cross-sectional view showing a circle C portion of FIG.

FIG. 6 is a perspective view showing a metal filter of a pressure adjusting device for a rotary feeder according to an embodiment of the present invention.

FIG. 7 is an enlarged explanatory view showing an arrangement state of gun metal particles constituting a metal filter of a pressure adjusting device for a rotary feeder according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal filter 2 Gun metal particles 10 Pressure adjusting device for rotary feeder 11 Silo 12 Hopper 13 Supply chamber 14 Rotary feeder 15 Motor 16 Rotary fan 16b Partition blade 16c Dividing chamber 18 Blower pipe 19 Delivery pipe 20 Decompression pipe

Claims (2)

[Claims] 1. A supply chamber for supplying powder such as cement to an upper opening of a rotary feeder, and a plurality of division chambers which are connected to the upper opening of the rotary feeder and are divided by a rotary fan to rotate. A decompression pipe that connects the division chamber and the supply chamber and sends the high-pressure air in the division chamber after the powder such as cement has been delivered into the supply chamber; and a movement of the powder such as cement that is arranged in the decompression pipe. A pressure adjusting device for a rotary feeder, comprising: 2. The pressure adjusting device for a rotary feeder according to claim 1, wherein the metal filter is formed by welding a plurality of gun metal particles.